Morrowind Dialog Explorer is a mod tool for the game The Elder Scrolls III: Morrowind. It allows you to search and explore Morrowind's dialog topics and responses.
You can learn more about MWDE at https://pineapplemachine.com/files/mwde.
To run MWDE, you'll need to have Python installed on your computer. MWDE is compatible with recent Python 2.x and Python 3.x versions. That means it will be hard for you to accidentally download a version of Python that doesn't work with MWDE. (If your computer runs OSX, then it probably had Python already installed when you got it.)
Once Python is installed on your computer, you will need to download Morrowind Dialog Explorer and unzip the archive. (The download link is at the top of this page.) You will need to set up MWDE by going into the extracted folder and opening the file named "config.ini". INI files are only a special kind of text file, so you can edit it with Notepad or your choice of plain text editor.
Inside "config.ini" is a lot of text to help you understand how it works. The most important part is to enter the paths to the Morrowind data files you want to load inside the "load_file_paths" section. Normally, this would be the paths to your Morrowind.esm, Tribunal.esm, and Bloodmoon.esm files.
Once you've set up your file paths, you're ready to run MWDE. Go back to the folder (the same one "config.ini" is in). On Windows, double-click on "Morrowind Dialog Explorer.bat". On OSX, open "Morrowind Dialog Explorer.app" instead. A new console window will open and it will show something like this. (Linux users should open a command line, navigate to the unzipped MWDE directory, and run "python src/dialog_explorer.py".)
C:\MWDE>"C:\MWDE\Morrowind Dialog Explorer.bat"
C:\MWDE\Morrowind Dialog Explorer>python src/dialog_explorer.py --config-path="./config.ini"
Loading "C:\Steam\steamapps\common\Morrowind\Data Files\Morrowind.esm"...
Loading "C:\Steam\steamapps\common\Morrowind\Data Files\Tribunal.esm"...
Loading "C:\Steam\steamapps\common\Morrowind\Data Files\Bloodmoon.esm"...
Finished loading 3 data files.
Morrowind Dialog Explorer v1.0 is ready.
query >
Now you're ready to start exploring! You can type "help" into the console for a list of commands. You can type "help <command>" to get help about how to use a particular command.